(19)
(11) EP 0 844 752 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.12.2000 Bulletin 2000/51

(43) Date of publication A2:
27.05.1998 Bulletin 1998/22

(21) Application number: 97119658.9

(22) Date of filing: 10.11.1997
(51) International Patent Classification (IPC)7: H04B 10/18, H04B 10/08
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 25.11.1996 JP 31359496

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventor:
  • Chikuma, Tadayuki
    Minato-ku, Tokyo (JP)

(74) Representative: Baronetzky, Klaus, Dipl.-Ing. et al
Splanemann Reitzner Baronetzky Westendorp Patentanwälte Rumfordstrasse 7
80469 München
80469 München (DE)

   


(54) Automatic dispersion compensating optical transmission system


(57) In an optical transmission system in which an optical main signal and a monitoring control optical signal are wavelength-multiplexed and transmitted from a transmitter and the optical signal is directly amplified by a repeater and transmitted, low frequency pulse signals which are synchronized with the respective optical main signal and monitoring control signal are multiplexed with each others, a distance of a transmission section is specified by a phase difference between the low frequency pulse signals according to a difference in propagation rate of a transmission line due to a difference of wavelength between the optical main signal and the monitoring control signal and the optimal dispersion compensation is made possible even when a required dispersion compensation is changed due to a change of the transmission line by switching the optical transmission line to a DCF having an optimal amount of dispersion compensation.






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